Note 6 - Liabilities Related to Sale of Future Royalties - Deferred Revenue Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Current portion	$ (1,862)	$ (1,381)
Long-term portion	2,372	$ 2,679
HealthCare Royalty Partners III, L.P. [Member] | Royalty Arrangement [Member]
Total liability related to sale of future royalties, start of period	4,060
Non-cash royalty revenue paid to HCRP	(331)
Non-cash interest expense recognized	505
Total liability related to sale of future royalties, end of period	4,234
Current portion	(1,862)
Long-term portion	$ 2,372